Self-opening die head



R. M. STRICKLAND SELF OPENING DIE HEAD led'July 29, 1926 2 Sheets-Sheet 1 2 Sheets-Sheet 2 J .5. 4 jay R. M. STRICKLAND SELF OPENING DIE HEAD Filed July 29, 1926 Aug. 23, 1927.

Patented Aug. 23, 1927. i i

P- -Ar ENT "OFF'I'C E.

%otce'm.' sw ut gw hgsm, 'ooNnEoTIcU ASSIGNORTO THE GEO E RIC "i'oncofo mw H'KV EN, coN'Nnc'TIcUT, A CoR'PoRATIoN.

smi-M LTING DIE :mm

me lis iew Lin ,idlevn 'a em o n e iieit e ex'; u Big. -2 is a, iew 'thereof ;in front elevation; v

r F is a tranverse sectional -vie w on the e 137 o Ei -g.. -5

nce to its proy ision ith sensitive and re 1 1 3 @;t 'llll tm w end, While its hear end hearsjuponan adilstab abutne t-nember 19 thi'eaded upon the die-head body 10.

or 'rleaebly holding the; Operatingsleeve 18 forward in itsohaser-closihgpositio'n, a'sshown in Fig. 4, Ienploy'a platolike looking-member 20 hayng diametrical movement With respectto the die-head and f ofned 'with a; central aperture 21 for the eception of 'the adjutable abutment-Inenhe Which it einbraces. The said lookingmember is loceted in a groove 22 formed upon the nteriorperphery of the rear end of the operating-sleeve 18. One Side of this groove is intersected by &radi-al passage 23 leading to-the exterior ;peripher'y 'of the said Qbrathg-Sleeve, So that the 'lockingmenher may be inserted radiilly the einto The locking-menber 20 'i fornied with 'an outwardly etending fiiger 24, beveled at its oute'rend ndd pted to be engaged by'a ca 's'urface 25 ;for med upon the nterior peripheryj of a tripping-sleeve 26, Which is also provided Withla peripheral 'groove 27 `and has limited rectilinealr 'movement upon the ope'a t hg-sleeve '18 which letter jis redued in diameter, 'as at 28, for its ccommodation.

At a poin't directly opposite the finger 24; and adj acent the 'a'p'erturg the 'looking-member 20 is adapted to ngae, under the urge of zt rflat spring 29,:with a portionof forwadlyrfa cing annular abutient-shoulder 30 fo nied upon the abutnentiheinbef 19, h

I Normlly te nding to nove the peratingleeve rearward with respect ,to the body 10, togpermitthe retraction of thechaersl unde th u ge of-their spring-plungers 15, are helicztl p i gs 31.(Figs. 2 and 8) housed within nearwardly opening receses 32 in the said: body and ngging a for h rdly-facing shoulder& of the chami-Operating men her. lloi eleiahly chek the reurward movement ofthe ope 'ating sleeie 18 under the irge of the 31 justdeeeribed, when the said lee ve reaches its intermediate or ohasers t po it t h h 'i mg L mpl'oy a pivotal stop-level" 34, s winging upon a ,35 within ap ecess 36 formed in the abutinent -mexnloerfw and normally held in iSQditwrdly-sWung ;poition 'by '21, springpresed plunger 37 `(Fig. 7)'.

As shown in Fgs 1 to 4 inclusive my inpfved die-head is in its closed position- 'ready for a threading operati; t which Hai ` shoulder 30 of the abutm-ent-member 19,

whereby the chasereoperating sleeve 18 is locked in its forward position against the counter-urge of the springs 31. At this time, also, the trpping-sleeve 26 is at the limit of its forward movement. I

At a predetermined point in the threading operation, during which the die-head is moved toward the work while rotating, the concurrent movement of the tripping-sleeve- 26 is arrested by any suitable abutment set in the machine in which the die-head is being used, in the usual and well-known manner, according to the character of the work. When the tripping-sleeve is thus arrested, the continued forward movement of the remaining parts of the die-head causes the finger 24 of the looking-member 20 to ride down the cam-surface 25 of the trippingsleeve and eventually disengage the portion of the looking-member lying opposite the finger 24 from the abutment-shoulder 30 of the abutment-member 19, as shown in Fig. 5 of the drawings. The springs 31 now assert themselves to move the operating-sleeve 18 rearward with respect to the body 10, until its movement is checked by its engage ment with the stop-lever 341, so as to permit the chasers 13 to be moved radially outward, away from the Work, by 'their sprng-actuated plungers 15, as shown in Fig. 6. I

In the event that it is desired to remove the chasers 13 from the die-head for any reason, the stop-lever 34 may be pressed inward to permit the sleeve 18 to slide rearwardly over it to an eXtent sufiicient to entrely disengage the forward end of the said sleeve from the chasers.

I claim:

1. A self-opening die-head, having a body; chasers mounted therein; a` reciprocating operating-sleeve for moving the said chasers; a plate-like locking-menber eX- tending transversely of the die-head and formed with a segmental locking-surface and having movement transverse to the aXis of the die-head for holding the said operating-sleeve in its chaser-closing position; a tripping-sleeve mounted upon the said ;operating-sleeve and having rectilinear movement with respect to the said body and operating-sleeve in a path substantially ata right angle to the path of movement of the said looking-member and adapted to move said looking-member into its unlocking position.

2. A self-opening die-head, having a body; chasers mounted therein; a reciprocating operating-sleeve for moving the said chasers; an abutment-vmember 'on the said 'member and havingmovement transverse to the axis of the die-head 'for holding the said operating-sleeve in its chaser-closing position; a tripping-sleeve mounted upon the saidoperating-sleeve and having rectilinear movement with respectto the said body and operating-sleeve in a path substantially at a right angle'to the path'of "movement of the said locking-member and adapted to move said looking-member into its unlock ing position. i

3. A self-opening die-head, body; chasers mounted thereinya reciprocating operating-sleeve for movingthe said chasers having its rear end shouldered and reduced in external diameter; an ad3ustable '75 having a abutnent-member onsaid body;-an aper- *tured looking-member co-acting with and embracing the said abutment-member and having movement transverse to the aXis of the die-head for holding the said operating-sleeve in`its chaser-closing'position; a tripping-sleevehavingits rear end shoul dered and reduced in internal diameter for engagement with the recluced portion of the operating sleeve, upon which it has relative rectilinear movement in a path substantially at a right angle to the *path of movementof the saidlocking-member, which latterit' is adapted toinove into its unlocking position.

4. A self-opening die-head, having a body; chasers mountedtherein; areciprocatng operating-sleeve for moving the said chasers having its'rear end s'houldered and reduced in external :diameter and "its ,interier periphery' formed'witha groove and with a wide radial 'passage connect-ing' the said groove to'the exterior periphery; 'an adjustable abutment-member i on said body; an apertured":locking-member located i within the above mentionedgroove andco-acting with and 'embracing the said abutmentmember and having movement transverse to the axis of the die-head for holding the said operating-sleeve in its chaser-closing position;`atrpping-sleeve having its rear end shouldered and reduced in internal diame-- ter for engagement with thereduced portion of the operating-sleeve,` upon which it has'relative rectilinear movement in a path substantially at a right angleto the path'- of movement of' the 'said' looking-member,

whichlatter it is adapted to move into its un'lockng position. v I r In testimony whereof, I have signed this specification. v 1 v 4 noren MLsrmoKL Nn. v 

